Finding the Third Proportional to 155,978.50 and 172,381

Step by Step Solution

1. Step 1: Write the proportion equation
   155,978.50 : 172,381 = 172,381 : x
2. Step 2: Convert to fraction form
   155,978.50/172,381 = 172,381/x
3. Step 3: Cross multiply
   155,978.50x = 172,381 × 172,381
4. Step 4: Simplify right side
   155,978.50x = 29,715,209,161
5. Step 5: Solve for x
   x = 29,715,209,161/155,978.50
6. Step 6: Final answer
   x = 190,508.37